If I had two million, I’m a two-millionaire.
If I had one million, I’m a one-millionaire.
If I had a million, am I an a-millionaire?

On a slightly similar topic: https://www.grammarly.com/blog/hyphen-in-compound-adjective-with-numbers/ we know that we can make compound adjectives by hyphenating numbers.

The president gave 10 one-minute speeches. This is valid.
Can you correctly say He gave 10 a-minute speeches?

My class is divided over this issue. Half is defending that "I am an a millionaire" is grammatically correct, despite it being obviously confusing and frowned upon. The other half thinks there is no hard rule that allows a to be interchanged with one that would warrant having the two articles, an a next to eachother.

closed as off-topic by Jason Bassford, JJJ, Chappo, marcellothearcane, jimm101 Aug 13 at 12:33

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    I just answered this here: ell.stackexchange.com/questions/220806/… – Juhasz Aug 9 at 21:48
  • This question is a more technically structured version of a question from English Language Learners: ell.stackexchange.com/questions/220806/… – user Aug 9 at 21:48
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    Is it really common to use expressions like "a two-millionaire"? Even with numbers other than a/one, it doesn't sound that natural to me. (Edit: I see that other people who posted or commented on the ELL post also seem to have had the same reaction as me.) – sumelic Aug 10 at 5:02
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    No, the article a can never be used in this way, as has been explained in answer to your previous question. A wealthy person is either a millionaire (having at least a million pounds/dollars) or a multi-millionaire (having many millions). – Kate Bunting Aug 10 at 7:56
  • The reason I believe this question belongs on ELU is because it's asking about the formal rules related to numerical word substitution. It's understood that it doesn't sound natural, and there are many preferred alternatives. But our debate is still hung- do the formally accepted rules of grammar permit the use of "...an a-millionaire" in any way? – user Aug 13 at 5:49